摘要
研究了Cr-Cu/SiO2催化剂上顺酐加氢反应和1,4-丁二醇脱氢反应耦合制备重要的精细化学品γ-丁内酯.耦合反应显著提高了顺酐转化率和γ-丁内酯选择性.Cr修饰提高了催化剂的脱氢活性,抑止了催化剂的过度加氢活性,使1,4-丁二醇的转化率和γ-丁内酯选择性显著提高.Cr修饰量为w=5%的Cr-Cu/SiO2催化剂上耦合反应的原料转化率为100%,γ-丁内酯选择性达98.8%.XRD,XPS等研究表明,Cr修饰促进了催化剂上铜元素的分散,氧化铬对氧化铜有给电子作用,Cr修饰的Cr-Cu/SiO2催化剂还原后比Cu/SiO2具有更多的Cu+,这有利于催化剂脱氢活性和γ-丁内酯选择性的提高.
The coupling process of dehydrogenation of 1,4-butanediol with hydrogenation of maleic anhy- dride over Cr-Cu/SiO2 catalysts to produce one important fine chemical γ-butyrolactone was studied, which shows advantages over the conventional processes. Cr improved the selectivity to γ-butyrolactone and conversion of 1,4-butanediol. The conversion of 1,4-butanediol and maleic anhydride reached 100%, and the selectivity to γ-butyrolactone was 98.8% over w=5% Cr2O3 modified Cr-Cu/SiO2. The results of XRD, XPS and TPR revealed that Cr improved the dispersion of Cu and had the electron donating effect on Cu. There are more Cu^＋ species on reduced Cr-Cu/SiO2 than Cu/SiO2. Cu^＋ is beneficial for dehydrogenation of 1,4-butanediol and the coupling process.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
2008年第11期1287-1292,共6页
Acta Chimica Sinica
